Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e21b4989f9a8e3…

MALICIOUS

PDF

84.2 KB Created: 2021-07-21 04:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9243ca1e51aa86e8cb23500d161008af SHA-1: 4d111dfa9bfa2943cecf6b8e9ff18fbcca047bd0 SHA-256: f0e21b4989f9a8e3cc87f55cd431f40e0635e338127c2edce5fb27c13596b539
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://georeno.ca/userfiles/files/57019395054.pdf In PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/87402ec585e86e68d0730100a82b8c0a/balasajesajanikanume.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad811e68e9---devozeluvejumuzumever.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/zowifulabakudebaziduf.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bcd4f16d1---liruf.pdfIn PDF document text
    • https://artbynela.com/uploads/file/vomapomomiroxudalekafi.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d23b1fcd312fcc21ab38d0b58768507f/17258151079.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/tamizudozujopoxuturig.pdfIn PDF document text
    • https://akconta.com/uploads/files/64887624711.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/30857262529.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/76319bdb489c1dcffb4f382c0787b6cf/24332501368.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/66704120682.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/0dm3ee1tt6ftpgo91q6f4rf6a1/67495115402.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2f6302qkj0ek1a83946tgr6up/16902513191.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/iihu2r31epmvpp3kgjv8dqt334/tipabijososomiwomuxufu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/3s9i1hn8b5a7qfd0b03tehtpca/vawufukulidojaxi.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/bae0f2f5e5f3df155a833a987549c7bd/70575374237.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d686598d8b3---8749473941.pdfIn PDF document text
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/nixuvejezoveve.pdfIn PDF document text
    • https://ingmarcomantovani.it/file/pawekijojozodakonidawola.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/71369337696.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b327b3dfe0e---motosudavifawomebat.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/43818972999.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/53764491430.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608df8171ea7e---7057862211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=188+chinese+yen+to+usdPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 10536 bytes
SHA-256: e7b16c9c228f1549353518382fff8be9968c6bb22f2caf910dd51bf92c35838e
font_01_sfnt_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 17076 bytes
SHA-256: 4447b8a108e20f37c63c8dc6b51fd915fdfd1ac3f7a13cf8ae6ee716d38ca545
font_02_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 1764 bytes
SHA-256: 25f153bab7c6b441bf0af0828d3e3272340631574bb0ddf5121e9364682dc2c3
font_03_sfnt_off00012b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1